package com.glory;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

public class CookieDemo01 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 服务器，告诉你，你来的时间，把这个时间封装成一个信件，你下带来，我就知道你来了。

        //设置响应头的文本内容
        resp.setContentType("text/html");

        //设置响应中文乱码
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");

        PrintWriter out = resp.getWriter();

        //Cookie,服务器端从客户端获取；
        Cookie[] cookies = req.getCookies(); //这里返回数组，说明cookie可能存在多个

        //判断Cookie是否存在
        if(cookies != null){
            //如果存在怎么办
            out.write("你上一次访问的时间是:");
            for (int i = 0; i < cookies.length; i++) {
                Cookie cookie = cookies[i];
                //获取cookie的名字
                if("lastLoginTime".equals(cookie.getName())){
                    // 获取cookie中的值
                    Long aLong = Long.parseLong(cookie.getValue());
                    Date date = new Date(aLong);
                    out.write(date.toLocaleString());
                }

            }

        }else{
            out.write("这是您第一次访问本站");
        }

        //服务端给客户端响应一个cookie
        Cookie name = new Cookie("lastLoginTime", System.currentTimeMillis()+"");
        name.setMaxAge(24*60*60);
        resp.addCookie(name);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
